The two terms get used almost interchangeably in everyday conversation, and it causes confusion. They’re not the same condition. The difference between them is the difference between a problem you can fully reverse and one you can only stabilise.
Both sit on the same spectrum of gum disease, and one frequently leads to the other if untreated. Knowing which you have shapes everything that follows, including the type of gum care you’ll need and how often you’ll need it.
Gingivitis: the early, reversible stage
Gingivitis is inflammation of the gum tissue without any loss of underlying bone. The gums look red, often slightly swollen along the margin, and bleed when you brush or use interdental brushes. The teeth themselves are unaffected at this point. The supporting bone is intact.
Importantly, gingivitis is fully reversible. With consistent home cleaning and a single thorough professional clean, the inflammation typically resolves within two to three weeks. The gums tighten back, the bleeding stops, and there’s no lasting damage.
Most adults in the UK have some degree of gingivitis at some point. Public Health data suggests upward of half the adult population shows signs at any given examination. It’s common, and it’s manageable.
Periodontitis: the later, irreversible stage
Periodontitis is what gingivitis becomes when the inflammation extends beyond the soft tissue and starts to affect the bone supporting the teeth. The bone resorbs, deeper pockets form between the gum and the tooth, and over time the teeth begin to loosen.
Once bone is lost, it doesn’t come back. Treatment can stop the loss progressing, and in some cases regenerate small amounts of bone with surgical techniques, but the bulk of what’s gone is gone. That’s the irreversibility we’re talking about.
Periodontitis is usually painless until it’s advanced. The signs are subtle: receding gums, teeth that look longer than they used to, food traps that didn’t exist a few years ago, occasional bad taste. By the time a tooth is loose, you’re looking at significant bone loss.
Around one in ten UK adults has severe periodontitis. The proportion rises with age and is significantly higher in smokers and people with poorly controlled diabetes.
Side by side: how to tell them apart
The clinical assessment uses pocket depths, bleeding patterns, and radiographs. The patient-facing differences are summarised below.
| Feature | Gingivitis | Periodontitis |
|---|---|---|
| Bone loss on radiograph | None | Present, often visible at the molars first |
| Pocket depth | Up to 3mm | 4mm or more, often 6mm+ in advanced cases |
| Bleeding on probing | Common | Common, often with pus in active cases |
| Gum recession | Rare | Common, often uneven across the mouth |
| Tooth mobility | None | Variable, late-stage sign |
| Reversibility | Fully reversible | Stabilisable, not reversible |
| Treatment | Hygiene phase, home care | Non-surgical therapy, sometimes surgical |
Note the boundary at around 4mm pocket depth. That’s the conventional dividing line between healthy or gingivitis and early periodontitis, although it’s not absolute. A 4mm pocket with no bone loss isn’t the same as a 4mm pocket with measurable recession.
How does one progress to the other?
Not everyone with gingivitis goes on to develop periodontitis. The progression depends on a combination of host susceptibility, bacterial composition in the mouth, and modifying factors like smoking, diabetes, and stress. Some patients can have gingivitis for years and never tip over the edge. Others progress within months.
Genetics play a part that we don’t fully understand. There are families where periodontitis runs strongly through generations despite reasonable hygiene, and individuals who develop severe disease in their thirties.
The strongest single predictor of progression is smoking. Smokers develop periodontitis at roughly two to three times the rate of non-smokers, and the disease tends to be more severe and respond less well to treatment. That’s not a moral judgement, it’s a clinical fact.
What treatment looks like for each
For gingivitis, treatment is straightforward: a thorough professional clean, oral hygiene coaching, and a follow-up at six to eight weeks to confirm resolution. That’s usually the entire course.
For periodontitis, treatment is sequenced and longer. The non-surgical phase, root surface debridement under local anaesthetic, runs over two to four visits. Re-evaluation at eight to twelve weeks confirms how the tissues have responded. Sites that haven’t responded may need re-treatment, surgical referral, or in some cases extraction if the prognosis is hopeless.
Maintenance after periodontal treatment is lifelong. Three-monthly recalls in the first year, lengthening to six-monthly if stable. Stopping the maintenance is the most common cause of recurrence.
Some patients find this discouraging. The honest answer is that lifelong maintenance is also true for any patient with implants, crowns, or significant restorative work. It’s not unique to gum disease.
When to get assessed
If you’ve noticed bleeding when brushing for more than a few weeks, or any of the later signs (recession, longer-looking teeth, food traps, bad breath that doesn’t shift), book an assessment. Without pocket charting and a look at the radiographs, you can’t tell which side of the gingivitis-periodontitis line you’re on.
Most patients are surprised by what a careful assessment shows. Some are reassured. Others find out they’ve got more going on than they realised.
If you’d like a clear, structured assessment of where your gums stand, we see patients for periodontal evaluation most weeks at Westcliff Dental Practice. Our team will tell you, plainly, whether you’re looking at gingivitis or something more, and what the appropriate plan is. To book, call us on 01702 344 500.
